This is a placeholder post. It exists to verify that the notes pipeline — Markdown rendering, front-matter parsing and syntax highlighting — works end to end. It will be replaced once there’s real content to publish.

Example: inspecting a certificate

A one-liner I reach for constantly when triaging a certificate:

openssl x509 -in cert.pem -noout -subject -issuer -dates

That’s it — subject, issuer and validity window in one shot.